6. No Man's Land

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Lily has forced Elliott to remember more than he perhaps ever wanted to about Philby, but in doing so, he's inclined to agree with her that he and other men of his privilege and class status are more of a real danger to England and America than any one man. Angleton has been warped by Philby to never trust any of his friends and colleagues again - a warping that will surely spread through the CIA and could even destroy it from within. Elliott and Lily understand that their suspicions of Hollis are a construct of the invisible hand of Philby and must therefore be treated with caution, if not dismissed entirely. Philby sends Elliott a letter asking for a meeting to bury the hatchet in an East Berlin bar. At Christmas time, Elliott travels to East Berlin to return a cherished memento.

5. Snow

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If Sir Roger Hollis is working for the Soviets, Elliott and Lily now have to assume that no-one can be trusted - they must get to Blunt before anyone else to interrogate him and confirm their suspicions. When Angleton hears of the deaths of his two agents in Moscow, he realizes that he's been played by his old friend Philby. In urgent need of a face-saving intelligence coup of his own, Angleton arranges for the apprehension and rendition of Blunt to a CIA safe house. However, Elliott and Lily are one step ahead and retrieve Blunt before it's too late, sending Angleton back to America with the friendly advice that he do everything he can to destroy all evidence of what Philby has done to him.

4. Vodka

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Elliott rattles Blunt's cage to make him panic, and he and Lily - who are now working together since she warned him that the CIA were about to step on his toes - follow Blunt to a clandestine meeting in the middle of the night with none other than Sir Roger Hollis, the Director General of MI5 and Lily's boss. The nature of Blunt and Hollis's tradecraft seems to indicate that if Blunt is working for the Soviets, then Hollis must be too. Meanwhile, Angleton's CIA field agents in Moscow are led into a trap by Philby and killed by the KGB.

3. Allegory of the Catholic Faith

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Philby begins to understand that the KGB can never fully trust him now that he's in Moscow - as far as they're concerned, his life as a spy for them is over. Philby is, however, in covert contact with his old friend James Jesus Angleton of the CIA, with whom he appears to be engaged in a long-term intelligence operation to infiltrate the KGB. In London, Elliott alerts Sir Anthony Blunt, cousin of the Queen and curator of her art collection, that his cover as a Soviet penetration agent has been blown - Lily realizes that Philby armed Elliott with the secret about Blunt in possible exchange for his life, but she also learns that the CIA and James Jesus Angleton are onto Blunt, which would rob Elliott of the value of the intelligence that Philby gave him.

2. The Admiral's Glass

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Lily Thomas understands that Elliott is never going to divulge anything of value about what actually happened in Beirut in a conventional interrogation process. She detects that he is a shrewd intelligence officer sitting on a secret while also doing his best to manage the emotional fallout from Philby's betrayal of their friendship. Understanding that Elliott needs to be out in the world acting upon any intelligence of worth after his return from Beirut, Lily uses her psychological skills as a debriefer to steer him in a direction that she believes will shed more light on why he let Philby run to Moscow.

1. Boom-Ooh-Yatatatah

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The first episode of the drama series based on author and journalist Ben Macintyre's book of the same name. In the wake of Kim Philby's escape to Moscow, Nicholas Elliott - his closest friend in Britain's Secret Intelligence Service (MI6) - is under investigation by Lily Thomas from the Security Service (MI5). Suspicions abound: Perhaps Nicholas facilitated Philby’s escape because he's also a traitor working for the Russians, perhaps his judgement was clouded at a critical moment by their 23-year friendship, or perhaps is he in fact having the last laugh after manipulating Philby to expose the bosom of the KGB for foreign intelligence purposes.